AIKIDO-2026-748505
fonttools is vulnerable to XML Injection
30
Low Risk
This Affects:
fonttoolsTL;DR
fontTools.varLib.avar.unbuild writes an avar table's axis mapping into generated DesignSpace/UFO XML without escaping the font's axis names or tags. A crafted font with axis names or tags that contain XML metacharacters breaks the structure of the generated XML or injects unexpected markup into it. The fix escapes axis names and tags before writing them into the output XML.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you convert a variable font's avar table into DesignSpace/UFO XML output.
Background info
fonttools is vulnerable to XML Injection in versions 1.0.0 - 4.65.0.
How to fix this
Upgrade the fonttools library to the patch version.
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